docs/121721: telnetd(8) not describing -X authentication types

[trhodes at FreeBSD.org]

Synopsis: telnetd(8) not describing -X authentication types

Responsible-Changed-From-To: freebsd-doc->trhodes
Responsible-Changed-By: trhodes
Responsible-Changed-When: Mon Jul 14 13:49:20 UTC 2008
Responsible-Changed-Why: 
Take - I have a patch but, having spent time away from FreeBSD,
want to get some mdoc(7) review first.  Thanks Jeremy!

http://www.freebsd.org/cgi/query-pr.cgi?pr=121721